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MR High-Resolution Blood Oxygenation Level–Dependent Venography of Occult (Low-Flow) Vascular Lesions

Benjamin C.P. LeeGo,a, Katie D. Voa, Daniel K. Kidoa, Pratik Mukherjeea, Juergen Reichenbacha, Weili Lina, Myeong S. Yoona and Mark Haackea

a From Washington University School of Medicine, St. Louis Children's Hospital, Mallinckrodt Institute of Radiology, St. Louis, MO.



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  		FIG 1. Diagram representative of the phase behavior of brain and veins. The phase mask is created by setting to unity (black regions) all positive phase values (0 to +2048), and negative phase values (0 to -2048) are displayed on a scale of 1 to 0 (hashed region)



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  		FIG 2. Comparison of HRBV and T2*-weighted images.

A, T2*-weighted echo-planar image (TE, 40) shows the susceptibility effects of multiple cavernomas. Susceptibility is present in the right frontal region.

B, HRBV image shows numerous additional lesions. Note that the margins of the cavernomas are defined better with this technique.



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  		FIG 3. Comparison of HRBV and contrast-enhanced T1-weighted images.

A, Contrast-enhanced T1-weighted image (750/20 [TR/TE] with one acquisition) shows slight enhancement (arrows).

B, HRBV image shows abnormal vessels in the same regions compatible with telangiectasias. Some of the vessels have configurations of veins.



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  		FIG 4. HRBV image shows a small vascular blush (arrow), which is a presumed telangiectasia, and an adjacent draining vein (arrowhead).

FIG 5.  Comparison of HRBV and contrast-enhanced T1-weighted images.

A, Contract-enhanced T1-weighted image (750/20 with one acquisition) shows enhancement of a typical venous angioma in the right cerebellopontine angle.

B, HRBV image shows numerous small vessels in addition to the enhancing vessels seen on the contrast study. These small vessels may represent small venous malformations or telangiectasias.



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  		FIG 6. HRBV image shows an example of the "ring" effect of two veins





Copyright © 2009 by the American Society of Neuroradiology. Print ISSN: 0195-6108 Online ISSN: 1936-959X